It is posible to downgrade the ambari from 2.4 to 2.2 (From HDP 2.5 to HDP 2.4) only ambari? What I try so far without suceed: -Backup of the db, https://community.hortonworks.com/articles/37765/backing-up-the-ambari-database-with-postgres.html -Remove ambari completely, https://community.hortonworks.com/questions/1110/how-to-completely-remove-uninstall-ambari-and-hdp.html -Start and setup the ambari 2.2 -Stop the ambari -Restore the db backup -Run command ambari-server upgrade -Even Run succesfully ambari-server check-database It shows: Using python /usr/bin/python Checking database No erros were found. Ambari Server 'check-database' completed successfully. <- by the way there is a typo error on the output -Try to start the ambari server and it show the following error: 28 Nov 2016 13:48:55,832 WARN [main] DatabaseChecker:184 - Current database store version is not compatible with current server version, serverVersion=2.2.2.0, schemaVersion=2.4.1 28 Nov 2016 13:48:55,833 ERROR [main] AmbariServer:844 - Failed to run the Ambari Server org.apache.ambari.server.AmbariException: Current database store version is not compatible with current server version, serverVersion=2.2.2.0, schemaVersion=2.4.1 at org.apache.ambari.server.controller.utilities.DatabaseChecker.checkDBVersion(DatabaseChecker.java:185) at org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:835) You my ask why I'm doing it, since I'm trying to install a service that works on the ambari 2.2.2.0 stack but on on the 2.4.1.0, probably ajusting the ecotool also may be a workaround but i don't have a what's new of the changes of how is the stack. ... View more